Oracle is no longer maintaining OpenJDK 8 and OpenJDK 11. Red Hat is providing bug fixes and security patches for OpenJDK 8 and OpenJDK 11, taking over from Oracle. If you are using OpenJDK from the default Ubuntu repositories, Oracle's license cancellation doesn't matter at all because Ubuntu will continue to support their Java packages the same way they support every other package in their repositories.
Although the Oracle Java packages have been discontinued, Java packages maintained by Ubuntu Developers can be installed from the default Ubuntu repositories instead. Run this command to list the available Java packages in the default Ubuntu repositories:
apt search openjdk-*
A JDK package from the default Ubuntu repositories has a package name
that has the following form is replaced by the Java version number.
openjdk-X-jdk where X